RSGS mission The Defense Advanced Research Projects Agency aims to complete a payload technology for its Robotic Servicing of Geosynchronous Satellites program this year in collaboration with a Northrop Grumman subsidiary and the Naval Research Laboratory. DARPA is responsible for supplying the RSGS payload that will fly on commercial robotic servicing spacecraft being developed by SpaceLogistics to support the mission targeted for a 2023 launch, the agency said Friday. SpaceLogistics was selected in March to build the mission robotic vehicle bus and support technology transition efforts under the program. The agency expects NRL to complete the integration of robotic arms with the payload structure and commence environmental tests of the hardware during 2021. "First, the RSGS spacecraft will fly around the client spacecraft to observe from a distance," said Joseph Parrish, a program manager DARPA's Tactical Technology Office.